Over the past days and weeks, Republicans have charged that the administration deliberately misled the public about the Libya attack - that they knew the attack was an act of terrorism but said it was sparked by a controversial film - in an effort to cover-up an al-Qaeda comeback in Libya.

"The Benghazi business is going to be one of the deciding factors in the election, " insisted Larry Kudlow. "And in my opinion the administration's story doesn't hang together."

The White House has, in the past, denied any intentional cover-up and counters that it has been completely transparent – providing its best intelligence on the attack, and then refining it as more information came to light.

The FBI is still investigating the attack. Secretary of State Hillary Clinton also has named a State Department review panel to look into the security arrangements in Libya.

On September 11, 2012 Ambassador, Christopher Stevens, and the other Americans were killed after Islamist gunmen attacked the U.S. consulate and a safe house refuge in Benghazi.